DETERMINATION OF PESTICIDE-RESIDUES IN ON ION, USING A MICROWAVE-OVEN

A rapid and efficient clean-up method was developed for determining 16 organochlorine pesticides, 8 pyrethroid pesticides and 24 organophosp horus pesticides in foodstuffs such as onion and garlic, which contain high levels of matrix compounds. First, the sample was treated in a m icrowave oven to inactivate enzymes which caused interfering peaks. Pe sticides were extracted with acetone, re-extracted with dichloromethan e and determined by ECD-GC and FPD-GC. Major interfering peaks were no t found on ECD-GC and FPD-GC chromatograms. Recoveries of the pesticid es were 49.8 similar to 132.5%.